Am I unsupportive?

My husband lost his job and wants to start working with me in my small marketing business. I just never dreamed or wanted to work together. My parents had their own business and I grew up with a lot of fighting and uncertainty, which is why I always wanted the safety of him having his own job.

My mind is fighting the idea. I feel bad and wish I could be like “Yay!  We are going to rock and make lots of money,” but instead I worry we won’t have enough money to pay our bills.  How can I change my thinking and become excited about this new adventure instead of blocking and fighting it?